a = 'Hello'
result = 'e' in a
print("e是否在变量a中：\n", result)

result1 = 'E' in a
print("E是否在变量a中：\n", result1)

result = 'e' not in a
print("e是否不在变量a中：\n", result)

result1 = 'E' not in a
print("E是否不在变量a中：\n", result1)